Tmobile’s got a nationwide 7.2mbps HSDPA network that is compatible with the 3G radios on phones from Europe and Asia. Compared to AT&T who has a different radio frequency for 3G and are still working on the 7.2mbps network, that’s pretty solid. They also have the lowest-priced unlimited data plans of any US carrier which helps the Nexus One come in $500-$1000+ less over the two year contract (the difference in the phone cost is $20) than the iPhone…and even the Verizon Droid.